Machine for turning moldings



(No Model.)

3 Sheets-Sheet 1. J. F. GEBHARDT.

MAGHINEFOR TURNING MOLDINGS.

Patented Mar. 19, 1889. 1

E If 5 WITNESSES:

N. PETERS Photo-Lithographer, Washington 0.0.

3 Sheets-Sheet 2.

(No Model.)

No. 399,871. Patented Mar. 19, 1889.

(No Model.) Y 3 Sheet s-Sheet 3.

J. P. GEBHARDT.

MACHINE FOR TURNING MOLDINGS.

No. 399,871. Patented Mar. 19,1889

& A

UNITED STATES aTnnT rricn.

JULIUS F. GEBIIARDT, OF PORT CHESTER, NEW YORK.

MACHINE FOR TURNING MOLDINGS.

SPECIFICATION forming part of Letters Patent N 0. 399,871, dated March19, 1889.

Application filed October 1, 1888. Serial No. 286,887. (No model.)

To all whom it may concern.-

Be it known that I, J ULIUs F. GE'BHARDT, of Port Chester, in the countyof \Vestchester, State of New York, have invented certain new and usefulImprovements in Machines for Turning Moldings, of which the following isa specification.

This invention relates to improvements in machines for turning moldings;and the obj ect of my invention is to provide a new and improvedattachment for turning-lathes of simple construction, by means of whichmoldings of different shapes can be turned very true and accurately andvery rapidly.

The invention consists of the combination, with a frame, of a swingingframe in the same, a series of rock-shafts in the swinging frame,cutters on the rock-shaft, and rods connecting the several rock-shaftswith the common han dlepieces.

The invention also consists in the construction and combination of partsand details, as will be fully described hereinafter, and finally pointedout in the claims.

In the accompanying drawings, Figure 1 is an elevation of aturning-lathe provided with my improvement. Fig. 2 is an enlarged frontelevation of my improvement, parts being broken out. Fig. 2 is a detailsectional view showing the device for adjusting the rocking leversvertically. Fig. 3 is a plan view of my improved attachment forturninglathes, parts being broken out and others in section. Fig. 4; isa side view of my improved attachment, parts being in section. Fig. 5 isa vertical transverse sectional view of the same. Fig. 6 is a side viewof a piece of molding and end views of the knives used for making thesame. Figs, 6 and 6 are inner face views of said knives or cutters. Fig.7 is a face view of another molding and end views of the knives orcutters for the same. Fig. 7 is an inner face view of one of saidcutters.

Similar letters of reference indicate corresponding parts.

The frame A is held vertically adj ustable in a tubular standard, A,that can be placed upon the bed-plate B of the lathe and moved in thedirection of the length of said bedplate. In the frame A another frame,is

pivoted by means of pivots G at the front end of the frame Athat is, atthe end nearest the operatorso that the inner end of said frame O canswing up or down. A spiral spring, 0*, surrounds a screw, G, screwedthrough the bottom of the frame A, and presses the swinging frame Cupward and against a cam, D, on one end of a rock-shaft, D, pivoted on asuitable bearing on the top of the frame A, the opposite end of saidrock-shaft being provided with an upwardly-projecting lever, D by meansof which the cam can be manipulated. The screw C, which forms the guidefor the spring C can be raised and lowered so as to act as a check forthe swinging frame 0, to prevent the same being pressed downward toofar.

On. the outer surfaces of the front and rear sides of the swinging frameC a series of ver tically-adjustable bearing-plates, E, are held byscrews E, passed through.longitudinal slots E in said bearing-platesinto the front and rear pieces of said swinging frame. In each twocorresponding bearing-plates E on the front and back of the swingingframe arock-shaft, F, is mounted.

On the outer end of each rock-shaft F a rod, G, is secured, each rodbeing provided at its lower end with a longitudinal slot, G. The severalrods G are connected by bolts G passed through the slots G, with aplate, I-I, having a downwardly-projcot-ing handle, H. From each side ofthe frame A a rod, I, proj ects, and 011 each of said rods an adjustablecheck-piece, I, is held for the purpose of regulating thelateralmovement of the swing ing rods G. ()n the inner ends of the rockingshafts F the cutters S are held. A centering sleeve, K, provided with alongitudinal slot, K and extending the length of the attachment, has itsends located within apertures K in the side pieces of the frame A, andis held and adjusted by screws 1.

()n a rock-shaft, L, in the frame A, an arm, M, is fixed, which isprovided with a markin g or gage blade, M. To the swinging end of saidarm M a link, N, is pivoted, and through the same a rod, 0, is passedand secured by means of a screw, l in said link. The upper end of therod 0 is pivoted to an arm, P, on the cam-shaft D.

0n the end of the shaft L an arm, Q, is held adj ustably, which isprovided on its swinging end with a marking or gage blade, R. The dowelW, from which the molding is turned, is passed through the guide-sleeveK, and the cutters S are so adjusted on the rock-shafts F F that theycan cut into the red, the cutting edges of said cutters being pressedagainst the rod by means of the cam D. By pressing down the cam D,thearm M is raised, also the arm 0 on theshaft L, and the markers R and Mcut into the rod a certain distance from each other. During the timethat the cutters are pressed down the handle II is swung to the left andthen to the right, or vice versa, as shown in dotted lines in Fig. 2,whereby the molding is cut. The dowel \V is then shifted to the rightuntil the mark made by the marking-blade R is in line with themarking-blade M, as that brings the dowel in the proper position inrelation to the cutters.

It is evident that the distance between the blades M and R must be equalto the length of molding out while swinging the rods G to the right andleft.

The cutters have different shapes, according to the molding to be made.In Fig. 7 a molding composed of a series of heads is shown. These beadsare cut in a single operation by three cutters, S. The bottom of thecutter has the same curvature as the beads, as have also theupwardly-projecting side wings of the cutter. The cutters are firstswung to one side from the position shown in Fig. 7 to the left, Fig.'7, and thereby cut one half of the beads on which the cutters rest andone half of the beads to the left. \Vhen swung in opposite direct-ions,they complete the bead on which they rest and the half-beads to theright, so that each cutter cuts one bead and the two half-beads at theopposite sides of the same. As soon as the handle D is released, thespring C presses the cutters upward, so as to permit shifting of thedowel to the desired length. To cut the molding shown in Fig. 7, thecenters of the cutters must be in the same plane and all cutters swungalike. In case a molding such as shown in Fig.6 is desired, differentcutters are used. To cut the part shown at a, Fig. 6, a cutter is used,the cutting-edge of which is meniscusshaped. The center on which thiscutter swings must not be in the same plane with the axis of themolding, but some distance below the same, as such cutter must have arolling motion, as indicated in dotted lines. To adj ust the out ter inthis position, the plates E of the rocking shaft F, on which said cutteris held, are adjusted higher than the plates of the remaining shafts. Tocut the moldings. b, Fig. 6, a different cutter is used, the bottom ofwhich is concave and the side convex. The bottom cuts the part b and theconvex side of the parts d, the cutter being first rocked to one sideand then to the other.

I have shown three cutters grouped; but it is evident that by increasingthe sides of the guide-frame a greater number of cutters may be used,and thus a greater length of molding cut in a single operation.

Various kinds of knives may be used, each cutting one single part orbead of the molding, or each cutter cutting one bead, the twohalf-beads, and so on.

IIavin g thus described my invention, I claim new and desire to secureby Letters Patent 1. In a lathe attachment for turning moldings, thecombination,with a frame, of a swinging frame in the same, a series ofrock-shafts in said swinging frame, cutters on the rockshafts, and rodsuniting the several rock-shafts with a common handle, substantially asset forth.

2. The con'ibination,with a frame, of a swinging frame in the same, aspring for pressing said frame upward, a cam for pressing it downward, aseries of rock-shafts in said frame and cutters on the rock-shafts, androds uniting the several rock-shafts with acommon handle, substantiallyas set forth.

3. The combination,\vith a frame, of a swing ing frame in the same,vertically-adjustable independent bearing-pieces on the swinging frame,a rock-shaft in each pair of bearingpieces, cutters on the rock-shafts,and rods uniting the several rocleshafts with a common handle,substantially as set forth.

4. The combination, with a frame, of a series of cutters, a rock-shaftcarrying two arms a short distance from each other, each arm beingprovided with a marking or gage blade, and mechanism for manipulatingsaid arms, substantially as set forth.

5. The combination,with a frame, of a swinging frame in the same,rocking shafts having cutters mounted in said swinging frame, acam-lever acting on the swinging frame, a shaft provided with two arms ashort distance from each other, marking-blades on said arms, one of saidarms being connected with the camshaft, substantially as set forth.

6. The combination, with a frame, of a slotted guide-sleeve in the same,a swinging frame mounted in the above-mention ed frame, rocking shaftsin the swinging frame, and cutters on said rocking shafts, substantiallyas set forth.

7. The combinatiomwith a frame, of a swinging frame in the same, rockingshafts in said swinging frame, cutters on the rocking shafts,

a rod on each shaft, the free ends of said rodsbeing slotted, and acommon handle-piece connected with the slotted ends of said bars,substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

JULIUS F. GEBI'IARDT.

\Vitn esses:

OSCAR F. GUNZ, JOHN A. STRALEY.

